Article
Engineering, Multidisciplinary
C. J. Ho, Chu-Yun Cheng, Tien-Fu Yang, Saman Rashidi, Wei-Mon Yan
Summary: This study explores the cooling effectiveness and entropy production of aluminum oxide-water nanofluid in circular tubes with wall conduction effects. Results show that heat transfer effectiveness ratios increase with higher input temperatures of fluid and nanoparticle concentrations. Additionally, local entropy production ratios are mostly below unity, indicating the beneficial use of nanofluids for reducing system irreversibility.
ALEXANDRIA ENGINEERING JOURNAL
(2022)
Article
Mechanics
Christopher D. Ellis, Hao Xia
Summary: This study improves the RANS modeling of film and effusion cooling flows by employing a neural network model, which enhances the prediction accuracy of Reynolds stress, velocity, and temperature fields. Experimental results demonstrate that the neural network model can effectively reproduce the Reynolds stress field in cases not used for training.
Article
Thermodynamics
Jiongjiong Zhang, Yuxiang Zhu, Shuhuai Yao, Qingping Sun
Summary: In this study, vertically and spirally grooved NiTi tubes (VGT and SGT) with large Aht records and excellent cooling performance were developed as compressive eC refrigerants. The experimental results showed that the grooved tubes achieved large zero-ATspan SCP and maximum no-cooling-load ATspan, exceeding most of the reported eC regenerators. Overall, the developed VGT and SGT showed great potential in heat transfer structure design for highly efficient eC devices.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Orhan Keklikcioglu, Veysel Ozceyhan
Summary: The experimental analysis of using convergent, convergent-divergent and divergent conical wire coils in the ethylene glycol and water mixture flow region showed that the conical wire coils enhance both heat transfer rate and fluid friction. New correlations were developed to predict Nusselt number and friction factor, making these configurations a potential technique to increase thermohydraulic performance in engineering applications.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
Article
Thermodynamics
Rui Zhao, Shi Bu, Xuhui Zhao, Lin Zhang, Weigang Xu, Zhikang Yu, Jiamei Fang, Yixiang Ji, Yiyang Hu, Bingguo Bao
Summary: The closed wet cooling tower exchanges heat by direct contact between the air in the tower and the process water. A new elliptical finned tube is proposed to improve thermal performance, with a mathematical model established to study heat and mass exchange. The impact of wind velocity and spray density on cooling tower thermal performance is analyzed.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2021)
Article
Thermodynamics
Ke Gan, Ruilian Li, Yi Zheng, Hui Xu, Ying Gao, Jiajie Qian, Ziming Wei, Bin Kong, Hong Zhang
Summary: A 3-dimensional enhanced heat pipe radiator has been developed to improve heat dissipation and temperature uniformity in cooling high-power electronic components. Experimental results show that the radiator has superior heat transfer performance compared to a conventional aluminum fin radiator under different heating powers and wind speed conditions.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Ting Zhang, Tingting Jing, Fei Qin, Xing Sun, Wenqiang Li, Guoqiang He
Summary: This paper presents a fluid-structure coupled topology optimization design of the regenerative cooling channel to improve heat transfer efficiency. Detailed three-dimensional numerical simulations were conducted to investigate the heat transfer processes of hydrocarbon fuel in the topology-optimized channels. Results reveal that the topology-optimized channel has significantly improved the heat transfer efficiency and flow distribution compared to the traditional straight cooling channel.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
M. J. Zeng, J. F. Zhang, S. Wang, Z. G. Qu
Summary: Ionic wind pumps have potential for flow control, heat transfer, and drying applications due to their advantages. A two-stage ionic wind pump with needle-to-mesh electrodes was developed for cooling electronics in this study. Experimental systems were used to test flow and heat transfer characteristics, investigating the effects of various parameters on the output velocity and power consumption of the pumps. The study provides guidance for heat dissipation designs for maintenance-free electronics in remote areas.
APPLIED THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Zepeng Wang, Zhongxian Yuan, Chunxu Du, Yimo Liu, Jie Wang
Summary: By improving the structure of the vacuum tube bed, the performance of the solar adsorption cooling system can be significantly enhanced using a finned tube bed, reducing cycle time and increasing specific cooling power. However, an excessive number of fins can lead to a decrease in system performance.
CASE STUDIES IN THERMAL ENGINEERING
(2022)
Article
Engineering, Mechanical
Bin Yang, Xinying Huai, Yanling Zhao, Minghao Xiu
Summary: This study presents a failure analysis of a double-sleeve rapid cooling heat exchanger used for the ethylene cracking process. It is found that the main cause of the four outer tube breaks is short-time local overheating. Countermeasures including verification of circulation ratio, consideration of safety factor in design, and monitoring of key parameters are proposed.
ENGINEERING FAILURE ANALYSIS
(2023)
Article
Thermodynamics
Shaobei Liu, Weixing Huang, Zewei Bao, Tao Zeng, Min Qiao, Jiancheng Meng
Summary: A novel technical solution for helically coiled tube-in-tube heat exchanger with double cooling source was proposed for regeneratively cooled air production in advanced aeroengines. 54 simulation runs were conducted to evaluate the impact of geometric and operating parameters on heat exchanger performance. Analysis revealed that outer tube curvature ratio and inner tube curvature ratio were significant structural parameters affecting entropy generation and outlet temperature of the regeneratively cooled air.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2021)
Article
Engineering, Aerospace
Yinlong Liu, Guoqiang Xu, Yanchen Fu, Jie Wen, Shaoshuai Qi, Lulu Lyu
Summary: This study investigates three analogous air-fuel heat exchangers designed for high Mach number aero-engines, analyzing the air pressure drop characteristics under different conditions such as mass flow rates and inlet temperatures.
CHINESE JOURNAL OF AERONAUTICS
(2022)
Article
Food Science & Technology
Zipei Huang, Ankang Kan, Jiaxi Lu, Fuliang Li, Tongzhou Wang
Summary: A mathematical model was established to investigate heat and mass transfer in vacuum cooling of cylindrical vegetables, with eggplants selected as the research target. Comparison of simulated and experimental data was conducted to validate the model, and additional simulation was carried out to study the influence of pressure reduction rate on temperature variation. Results showed that temperature difference tends to decrease with increasing pressure reduction rate, and the simulation data were consistent with experimental values.
INNOVATIVE FOOD SCIENCE & EMERGING TECHNOLOGIES
(2021)
Review
Thermodynamics
Mei Yang, Guangrong Li, Fan Liao, Jingde Li, Xiang Zhou
Summary: The study investigated the influence of supercritical CO2 on cooling heat transfer and pressure drop in horizontal helically coiled tube with non-circular cross section. It was found that with the increase of polygon edge number, heat transfer and pressure drop increase, but the range of increase gradually decreases; when the polygon edge number reaches a certain extent, pressure drop decreases. Additionally, the increase in pitch P, diameter d, and radius R leads to a decrease in heat transfer, with different effects on pressure drop.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
Jorge Duarte Benther, Vrushub Bhatt, Juan Diego Pelaez Restrepo, Cameron Stanley, Gary Rosengarten
Summary: High heat generation in the electronics industry hampers further innovations. Spray cooling is a promising technique for cooling high-temperature objects. This study investigates the fluid dynamics and heat transfer of multiple droplet impingement, providing insights for future spray cooling system design and optimization.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
Naveen Kushwaha, Agus P. Sasmito, Vimal Kumar
Summary: This study numerically investigates the boiling phenomena over a spherical surface at different degrees of superheat. Various phenomena such as vapor sliding, bubble formation, and induced vorticity are illustrated to provide a deep understanding of the boiling process. The effect of superheat on bubble pinch-off time and volume is also examined. Additionally, a correlation and artificial neural network model are developed to predict vapor generation during boiling over the spherical surface.
Article
Thermodynamics
Yuguo Gao, Yilin Ning, Chengzhen Wu, Minghan Xu, Saad Akhtar, Arun S. Mujumdar, Agus P. Sasmito
Summary: By comparing the effects of impinging and non-impinging jet, the experimental results show that impinging jet can make the water droplets smaller, more evenly distributed and have longer residence time, which improves the turbulence flow and heat transfer efficiency, reduces the supercooling of water, and increases the production of ice particles. In addition, the impinging flow system has a higher refrigeration coefficient, which significantly improves the refrigeration efficiency of the ice-making system.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Samson P. Pinto, Piyush Dandagawhal, Agus P. Sasmito, Joshua Lacey
Summary: A two-dimensional axisymmetric model has been proposed to predict property changes in a seasonal rock-pit energy storage (RPES) system. The model, which simplifies the geometry of the rock-pit, has been solved using both linear thermal equilibrium (LTE) and linear thermal non-equilibrium (LTNE) models. The findings suggest significant energy savings, increased heat storage capacity with higher thermal mass rocks, and a return on investment of under 12 years.
Article
Thermodynamics
Ahmad F. Zueter, Muhammad S. K. Tareen, Greg Newman, Agus P. Sasmito
Summary: In this study, a fully-conjugate computational-fluid-dynamics (CFD) model was developed to analyze the heat extraction capacity and profile of super-long thermosyphons in artificial ground freezing (AGF). The results showed the presence of a no-boiling-zone below 10-25 m of pool surface. The charge pressure significantly influenced the startup of the thermosyphon. Lower wind temperature extracted more heat from the ground in a similar manner to higher wind temperature. Overall, this study provides fundamental understanding of the performance of super-long thermosyphons in AGF.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Thermodynamics
Yuguo Gao, Yitao Ren, Minghan Xu, Junjun Liu, Arun S. Mujumdar, Agus P. Sasmito
Summary: This article prepared water-based graphene oxide (GO), Al2O3, and GO-Al2O3 hybrid nanofluids using a two-step approach, and investigated the effects of thermal cycling on the stability and thermal conductivity of nanofluid ice slurry. The study also proposed a thermal conductivity model considering thermal cycling and mass fraction. Results showed that the stability of nanofluids decreased gradually with the increase of phase change cycles, but tended to stabilize after 6 cycles. The thermal conductivity of GO-Al2O3 hybrid nanofluid ice slurry was between that of GO and Al2O3 aqueous single nanofluid after phase change thermal cycling.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Engineering, Geological
Samir M. Deyab, Adel Ahmadihosseini, Hamed Rafezi, Ferri Hassani, Agus P. Sasmito
Summary: Over the past decade, numerous studies have evaluated the effectiveness of microwave treatment in improving rock fragmentation. This study takes a different approach by investigating the applicability of mode I fracture toughness parameters for evaluating the effectiveness of microwave treatment as a rock pre-conditioning method based on energy analysis. The study shows that for the basalt rock used, a minimum diameter of 70 mm is required for fracture toughness experiments. The use of a finite element numerical model to optimize energy absorption in the sample cavity demonstrates significant improvements in microwave efficiency and weakening energy.
ROCK MECHANICS AND ROCK ENGINEERING
(2023)
Review
Energy & Fuels
Leyla Amiri, Hamidreza Ermagan, Jundika C. Kurnia, Ferri Hassani, Agus P. Sasmito
Summary: Thermal energy storage is necessary for efficient utilization and conversion of thermal energy. Rock thermal energy storage (RTES) has gained attention due to its capability to hold large amounts of thermal energy, simple storage mechanism and low cost. Technical challenges include pressure drop and suboptimal heat transfer. To address these challenges and guide future research, comprehensive review of current technology and development of RTES is essential. Non-technical aspects such as policy and community awareness will also be discussed.
ENERGY SCIENCE & ENGINEERING
(2023)
Article
Chemistry, Physical
Seyed Salar Hoseini, Alireza Seyedkanani, Gholamhassan Najafi, Agus P. Sasmito, Abdolhamid Akbarzadeh
Summary: Before replacing fossil fuels, it is important for renewable energy options to address the challenges of conversion and storage. This necessitates the development of advanced materials that can enhance the effectiveness of energy conversion and storage systems. Multiscale architected porous materials offer opportunities for optimized energy conversion and storage due to their controllable porosity and other desirable characteristics. This comprehensive review explores the advancements in utilizing such materials for renewable energy storage and conversion applications, providing valuable insights and research guidance for their future implications in renewable energy systems.
ENERGY STORAGE MATERIALS
(2023)
Article
Engineering, Geological
Haitham M. Ahmed, Adel Ahmadihosseini, Ferri Hassani, Mohammed A. Hefni, Hussin A. M. Ahmed, Hussein A. Saleem, Essam B. Moustafa, Agus P. Sasmito
Summary: This study presents a novel experimental method to evaluate rock failure mechanisms due to microwave treatment and finds that the presence of microwave absorbing minerals can enhance microwave efficiency and lead to heat concentration inside the rock.
JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING
(2023)
Article
Engineering, Chemical
Abdul Zahir, Perumal Kumar, Agus Saptoro, Milinkumar Shah, Angnes Ngieng Tze Tiong, Jundika Candra Kurnia, Samreen Hameed
Summary: This study focuses on the optimization of monoethanolamine (MEA) dispersion in rotating packed bed (RPB) for CO2 absorption. Computational fluid dynamics (CFD) model is developed and validated, and the effect of operational parameters on MEA dispersion is investigated. The liquid dispersion of MEA is modeled using response surface methodology, artificial neural network, and adaptive neuro-fuzzy inference systems. The comparison of the modeled data shows that artificial neural network is the most capable model for predicting MEA dispersion. Inlet velocity of MEA is found to be an insignificant parameter that does not contribute significantly to MEA dispersion in RPB.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2023)
Article
Thermodynamics
Kim Leong Liaw, Jundika C. Kurnia, Wen Kang Lai, Khai Chuin Ong, Muhammad Aliff, Mohd Ali Zar, M. Fadhli B. Muhammad
Summary: This study uses Computational Fluid Dynamics (CFD) and the Taguchi method to optimize the nozzle and blade of a compact non-combustion impulse gas turbine. The results show that the optimized turbine has significantly higher power output compared to the original turbine.
Article
Thermodynamics
Minghan Xu, Yosuke Hanawa, Saad Akhtar, Atsushi Sakuma, Jianliang Zhang, Junichi Yoshida, Masakazu Sanada, Yuta Sasaki, Agus P. Sasmito
Summary: We propose a multi-scale solidification framework for pure substances, combining laboratory experiments and mathematical modeling. State-of-the-art thermal control chamber and optical devices are utilized to capture the multi-scale phenomena of solidification. A unified mathematical model is developed to quantitatively examine the solidification process at three scales, and the results show good agreement with experimental data.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Thermodynamics
Yuguo Gao, Jiaqi Luo, Fu Fang, Minghan Xu, Mohammaderfan Mohit, Tariq Shamim, Agus P. Sasmito
Summary: Nanofluid ice slurry stability was evaluated and compared between a dynamic and a static production method, and empirical correlations for predicting thermophysical properties based on phase-change cycles were developed.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Minghan Xu, Saad Akhtar, Mohammaderfan Mohit, Ahmad F. Zueter, Agus P. Sasmito
Summary: In this study, a two-phase Stefan problem with a convective or Robin boundary condition is formulated, without assuming that the interface moves instantaneously at time t = 0. A comprehensive asymptotic analysis is performed and the method of property averaging is employed. The developed asymptotic solution is verified and found to extend the valid range of the Stefan number compared to conventional techniques.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Review
Green & Sustainable Science & Technology
Saad Akhtar, Minghan Xu, Mohammaderfan Mohit, Agus P. Sasmito
Summary: This article reviews various mathematical approaches used to model droplet freezing at different stages. It analyzes the application of these approaches in pharmaceutical, food, energy storage, meteorology, and process industry fields. The review concludes that while significant progress has been made in macro-scale modeling of droplet solidification, there is a need for further development of holistic mathematical models that incorporate nucleation dynamics.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2023)
Article
Thermodynamics
Hai Zhao, Puzhen Gao, Xiaochang Li, Ruifeng Tian, Hongyang Wei, Sichao Tan
Summary: This study numerically investigates the interaction between flow-induced vibration and forced convection heat transfer in a tube bundle. The results show that the impact of flow-induced vibration on heat transfer varies in different flow velocity regions.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Rohit Chintala, Jon Winkler, Sugirdhalakshmi Ramaraj, Xin Jin
Summary: The current state of fault detection and diagnosis for residential air-conditioning systems is expensive and not suitable for widespread implementation. This paper proposes a cost-effective solution by introducing an automated fault detection algorithm as a screening step before more expensive tests can be conducted. The algorithm uses home thermostats and local weather information to identify thermodynamic parameters and detect high-impact air-conditioning faults.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
A. Azimi, N. Basiri, M. Eslami
Summary: This paper presents a novel optimization algorithm for improving the water-film cooling system of photovoltaic panels, resulting in a significant increase in net energy generation.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Duc-Thuan Phung, Chin-Hsiang Cheng
Summary: In this study, a novel CFDMD model is used to analyze and investigate the behavior of thermal-lag engines (TLE). The study shows that the CFDMD model effectively captures the thermodynamic behavior of the working gas and the dynamic behavior of the engine mechanism. Additionally, the study explores the temporal evolution of engine speed and the influence of various parameters on shaft power and brake thermal efficiency. The research also reveals the existence of a thermal-lag phenomenon in TLE.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Haiying Yang, Yinjie Shen, Lin Li, Yichen Pan, Ping Yang
Summary: The purpose of this article is to find a measure to improve the interfacial thermal transfer of graphene/silicon heterojunction. Through molecular dynamics simulation, it is found that surface modification can significantly reduce the thermal resistance, thereby improving the thermal conductivity of the graphene/silicon interface.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Qiong Wu, Yancheng Wang, Haonan Zhou, Xingye Qiu, Deqing Mei
Summary: This article introduces a visible methanol steam reforming microreactor, which uses an optical crystal as an observation window and measures the reaction temperature in real-time using infrared thermography. The results show that under lower oxygen to carbon ratio conditions, the microreactor has a higher heating rate and a stable gradient in temperature distribution.
APPLIED THERMAL ENGINEERING
(2024)
Review
Thermodynamics
Giulia Manco, Umberto Tesio, Elisa Guelpa, Vittorio Verda
Summary: In the past decade, there has been a growing interest in studying energy systems for the combined management of power vectors. Most of the published works focus on finding the optimal design and operations of Multi Energy Systems (MES). However, for newcomers to this field, understanding how to achieve the desired optimization details while controlling computational expenses can be challenging and time-consuming. This paper presents a novel approach to analyzing the existing literature on MES, with the aim of guiding practical development of MES optimization. Through the discussion of six case studies, the authors provide a mathematical formulation as a reference for building the model and emphasize the impact of different aspects on the problem nature and solver selection. In addition, the paper also discusses the different approaches used in the literature for incorporating thermal networks and storage in the optimization of multi-energy systems.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Xuepeng Yuan, Caiman Yan, Yunxian Huang, Yong Tang, Shiwei Zhang, Gong Chen
Summary: In this study, a multi-scale microgroove wick (MSMGW) was developed by laser irradiation, which demonstrated superior capillary performance. The surface morphology and performance of the wick were affected by laser scan pitch, laser power, repetition frequency, and scanning speed. The MSMGW showed optimal capillary performance in alumina material and DI water as the working fluid.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Maofei Mei, Feng Hu, Chong Han
Summary: This paper proposes an effective local search method based on detection of droplet boundaries for understanding the dynamic process of droplet growth during dropwise condensation. The method is validated by comparing with experimental data. The present simulation provides an effective approach to more accurately predict the nucleation site density in future studies.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Rahul Kumar Sharma, Ashish Kumar, Dibakar Rakshit
Summary: The study explores the use of phase change materials (PCM) as a retrofit with Heating Ventilation and Air-conditioning systems (HVAC) to reduce energy consumption and improve air quality. By incorporating PCM with specific thickness and fin configurations, significant energy savings can be achieved in comparison to standard HVAC systems utilizing R134a. This research provides policymakers with energy-efficient and sustainable solutions for HVAC systems to combat climate change.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Zhenhua Ren, Xiangjin Meng, Xingang Qi, Hui Jin, Yunan Chen, Bin Chen, Liejin Guo
Summary: This paper investigates the heat transfer mechanism and factors influencing thermal radiation in the process of supercritical water gasification (SCWG) of coal, and proposes a comprehensive numerical model to simulate the process. Experimental validation results show that thermal radiation accounts for a significant proportion of the total heat exchange in the reactor and a large amount of radiant energy exists in the important spectral range of supercritical water. Enhancing radiative heat transfer can effectively increase the temperature of the reaction medium and the gasification rate.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Mauro Abela, Mauro Mameli, Sauro Filippeschi, Brent S. Taft
Summary: Pulsating Heat Pipes (PHP) are passive two-phase heat transfer devices with a simple structure and high heat transfer capabilities. The actual unpredictability of their dynamic behavior during startup and thermal crisis hinders their large-scale application. An experimental apparatus is designed to investigate these phenomena systematically. The results show that increasing the number of evaporator sections and condenser temperature improves the performance of PHP. The condenser temperature also affects the initial liquid phase distribution and startup time.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Ke Gan, Ruilian Li, Yi Zheng, Hui Xu, Ying Gao, Jiajie Qian, Ziming Wei, Bin Kong, Hong Zhang
Summary: A 3-dimensional enhanced heat pipe radiator has been developed to improve heat dissipation and temperature uniformity in cooling high-power electronic components. Experimental results show that the radiator has superior heat transfer performance compared to a conventional aluminum fin radiator under different heating powers and wind speed conditions.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Xinyi Zhang, Shuzhong Wang, Daihui Jiang, Zhiqiang Wu
Summary: This study focuses on recovering waste heat from blast furnace slag using dry centrifugal pelletizing technology. A comprehensive two-dimensional model was developed to analyze heat transfer dynamics and investigate factors influencing heat exchange efficiency. The findings have important implications for optimizing waste heat recovery and ensuring safe operations.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Xincheng Wu, An Zou, Qiang Zhang, Zhaoguang Wang
Summary: The boosting heat generation rate of high-performance processors is challenging traditional cooling techniques. This study proposes a combined design of active jet intermittency and passive surface modification to enhance heat transfer.
APPLIED THERMAL ENGINEERING
(2024)
